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Old 01-09-2017, 9:43 PM   #1
kwajtrader kwajtrader is offline
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Calibrate your refractometer with calibration fluid!

I figure itís good to let others learn from my mistakes, so here goes. I couldnít figure out why nothing I was doing was getting my calcium above 380 and Mg was equally low. I had calibrated my refractometer to zero using RODI water and had my salinity at 1.024. Turns out after recalibrating with 35ppm calibration fluid, I was actually below 1.020. After slowly raising it to 1.026 over the course of a week+, Iím now at 440 Ca and 1400 Mg. By far the least expensive fix since getting into this hobby!

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